I posted this in a comment on Facebook:
We should have known this was possible from the rise of the gamergaters, and the Sad/Rabid Puppies. Those both have their roots in white supremacist/Nazi movements, no matter what they say. (And a lot of their members are open Nazi ("alt-right") supporters.) Their grievance is basically that women, POC, LGBTQIA people want to participate in games, in SF/F fandom and the SF/F and gaming professional communities and they want to reserve all of that for straight white men.
Keep that in mind when the Sad Puppies whine at you at the next convention. Remember these are people who benefit directly from Nazism and are perfectly happy with that.